From f090eb672714233eea7f13dd56c2fd159fd6bd7e Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Fri, 17 Jun 2011 01:17:25 +0300
Subject: SWORD25: Fix image blending for black

This fixes exit menu.
---
 engines/sword25/gfx/image/renderedimage.cpp | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'engines/sword25/gfx')

diff --git a/engines/sword25/gfx/image/renderedimage.cpp b/engines/sword25/gfx/image/renderedimage.cpp
index a9c9de4f0c..f5f33d8e02 100644
--- a/engines/sword25/gfx/image/renderedimage.cpp
+++ b/engines/sword25/gfx/image/renderedimage.cpp
@@ -373,17 +373,23 @@ bool RenderedImage::blit(int posX, int posY, int flipping, Common::Rect *pPartRe
 
 				default: // alpha blending
 #if defined(SCUMM_LITTLE_ENDIAN)
-					if (cb != 255)
+					if (cb == 0)
+						*out = 0;
+					else if (cb != 255)
 						*out += ((b - *out) * a * cb) >> 16;
 					else
 						*out += ((b - *out) * a) >> 8;
 					out++;
-					if (cg != 255)
+					if (cg == 0)
+						*out = 0;
+					else if (cg != 255)
 						*out += ((g - *out) * a * cg) >> 16;
 					else
 						*out += ((g - *out) * a) >> 8;
 					out++;
-					if (cr != 255)
+					if (cr == 0)
+						*out = 0;
+					else if (cr != 255)
 						*out += ((r - *out) * a * cr) >> 16;
 					else
 						*out += ((r - *out) * a) >> 8;
@@ -393,17 +399,23 @@ bool RenderedImage::blit(int posX, int posY, int flipping, Common::Rect *pPartRe
 #else
 					*out = 255;
 					out++;
-					if (cr != 255)
+					if (cr == 0)
+						*out = 0;
+					else if (cr != 255)
 						*out += ((r - *out) * a * cr) >> 16;
 					else
 						*out += ((r - *out) * a) >> 8;
 					out++;
-					if (cg != 255)
+					if (cg == 0)
+						*out = 0;
+					else if (cg != 255)
 						*out += ((g - *out) * a * cg) >> 16;
 					else
 						*out += ((g - *out) * a) >> 8;
 					out++;
-					if (cb != 255)
+					if (cb == 0)
+						*out = 0;
+					else if (cb != 255)
 						*out += ((b - *out) * a * cb) >> 16;
 					else
 						*out += ((b - *out) * a) >> 8;
-- 
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